Can't find it right now but it must have been something like this.
When you do this, best pull connector from J102 and J122 to J132 to work safe.

test sol11 (resized).jpg

Could be a problem with a resistor as well. Check all components in the circuit of solenoid#11, from R90 to D22 in the picture.

The resistors are very much the same as here on the testboard.
The diode seems lower than normal. I've readings more like 480-500mV. I would replace D22.

Hole 2 (collector) and 3 (emittor) should not have continuity.

Follow trace from hole2 to J127-4 / J129-4 and check for metal/solder that doesn't belong on this path.
The only component on this trace is the anode-side of D22. (Cathode goes to +50V)

It is possibe conductive. Try to remove the blackened area and measure again for continuity.
This is also one of the few places where output and ground are close together.

sol11 short (resized).jpg